Get started
Create an account
Sign up at smith.langchain.com (no credit card required).
You can log in with Google, GitHub, or email.
Create an API key
Go to your Settings page → API Keys → Create API Key.
Copy the key and save it securely.
Choose your integration
LangSmith works with many frameworks and providers including OpenAI, Anthropic, CrewAI, Vercel AI SDK, Pydantic AI, and more.
Browse available integrations to connect your stack.
Observability
Gain visibility into every step your application takes to debug faster and improve reliability.
Evaluation
Measure and track quality over time to ensure your AI applications are consistent and trustworthy.
Deployment
Deploy your agents as Agent Servers, ready to scale in production.
More ways to build
Platform setup
Use LangSmith in managed cloud, in a self-hosted environment, or hybrid to match your infrastructure and compliance needs.
Studio
Use a visual interface to design, test, and refine applications end-to-end.
Prompt testing
Iterate on prompts with built-in versioning and collaboration to ship improvements faster.
Agent Builder
Design and deploy AI agents visually with a no-code interface—perfect for rapid prototyping and getting started without writing code.
LangSmith meets the highest standards of data security and privacy with HIPAA, SOC 2 Type 2, and GDPR compliance. For more information, see the Trust Center.
Workflow
LangSmith combines observability, evaluation, deployment, and platform setup in one integrated workflow—from local development to production.
Connect these docs to Claude, VSCode, and more via MCP for real-time answers.